Mozilla problems

Hi I have been meaning to thank you guy for helping out with malware issues and I meant to post a screen cap of a problem but it became to time consuming esp when all the problems seemed to have been solved.
However all of a sudden mozilla wont play any youtube footage it just comes up with a quicktime symbol and thats it. I have reinstalled mozilla and quicktime but no dice. any ideas? please help I dont want to resort back to IE

 

Hi thanks. Uninstalled quicktime and now mozilla works fine go figure. anyway thanks to major geeks I can use my pc without problems this is the best support website out there.
cheers